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EN 10088-1 X11CrMoWVNb9-1-1 vs ASTM A387/A387M Grade 91

Related Material — 65% match based on chemical composition and mechanical property overlap.

EN 10088-1 X11CrMoWVNb9-1-1 (EN 10088-1:2023) and ASTM A387/A387M Grade 91 (ASTM A387/A387M:2011) are both steel grades. EN 10088-1 X11CrMoWVNb9-1-1 is classified under Stainless Steel, while ASTM A387/A387M Grade 91 is classified under Alloy Steel — a different category, which is worth noting alongside the chemistry match below. EN 10088-1 X11CrMoWVNb9-1-1 is defined under European Standard (EN), originating from Europe, while ASTM A387/A387M Grade 91 is defined under ASTM International, originating from United States.

As per chemical composition, EN 10088-1 X11CrMoWVNb9-1-1 vs ASTM A387/A387M Grade 91 is a 66.9% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 65%.

Frequently Compared With EN 10088-1 X11CrMoWVNb9-1-1:
ASTM A959 .- GB/T 3280 06Cr19Ni10 GOST 5632 06Kh23N28 GOST 5632 08X18H10 EN 10088-1 1.4006 EN 10088-1 1.4301 EN 10088-1 1.4401 EN 10088-1 1.4845 IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoH IS 1570 (Part 7) 12Cr12MoVH IS 1570 (Part 7) 12Cr12Ni2Mo
Match Breakdown
CHEMISTRY MATCH
66.9%
MECHANICAL MATCH
No shared data
OVERALL
65%
Specifications
Property EN 10088-1 X11CrMoWVNb9-1-1 ASTM A387/A387M Grade 91
Standard EN 10088-1:2023 ASTM A387/A387M:2011
Category Stainless Steel Alloy Steel
C (%) 0.09-0.13 0.08-0.12
Si (%) 0.10-0.50 0.20-0.50
Mn (%) 0.30-0.60 0.30-0.60
P (%) <=0.020 <=0.020
S (%) <=0.010 <=0.010
Cr (%) 8.5-9.5 8.00-9.50
Mo (%) 0.90-1.10 0.85-1.05
Ni (%) 0.10-0.40 <=0.40
N (%) 0.050-0.090 0.030-0.070
Al (%) <=0.040 <=0.02
Nb (%) 0.060-0.10 0.06-0.10
V (%) 0.18-0.25 0.18-0.25
W (%) 0.90-1.10 Not specified
B (%) 0.0005-0.0050 Not specified
Ti (%) Not specified <=0.01
Zr (%) Not specified <=0.01
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property EN 10088-1 X11CrMoWVNb9-1-1 ASTM A387/A387M Grade 91
Tensile Strength Not specified 585-760 MPa
Yield Strength Not specified >=415 MPa
Elongation Not specified >=18%
Condition Not specified Class 2 plates, no thickness ranges printed; elongation in 50 mm gauge length
Typical Applications
EN 10088-1 X11CrMoWVNb9-1-1
Not documented
ASTM A387/A387M Grade 91
Welded boilers and pressure vessels for elevated temperature service
Key Differences
Can EN 10088-1 X11CrMoWVNb9-1-1 Be Substituted With ASTM A387/A387M Grade 91?
EN 10088-1 X11CrMoWVNb9-1-1 and ASTM A387/A387M Grade 91 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
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EN 10088-1 X11CrMoWVNb9-1-1
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ASTM A387/A387M Grade 91
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Frequently Asked Questions
What is the difference between EN 10088-1 X11CrMoWVNb9-1-1 and ASTM A387/A387M Grade 91?
Different category: EN 10088-1 X11CrMoWVNb9-1-1 is Stainless Steel, ASTM A387/A387M Grade 91 is Alloy Steel. EN 10088-1 X11CrMoWVNb9-1-1 specifies W, B which are not specified for ASTM A387/A387M Grade 91. ASTM A387/A387M Grade 91 specifies Ti, Zr which are not specified for EN 10088-1 X11CrMoWVNb9-1-1.
Can EN 10088-1 X11CrMoWVNb9-1-1 be substituted with ASTM A387/A387M Grade 91?
EN 10088-1 X11CrMoWVNb9-1-1 and ASTM A387/A387M Grade 91 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.